Ключевые слова: air, air pollution, atmosphere, chemical, chimney, city, climate, cloud, contamination, damage, danger, dioxide, dirty, dust, ecology, emission, energy, environment, environmental, factory, fog, fume, gas, global, global warming, haze, health, industrial, industry, outdoor, pipe, plant, pollute, pollution, power, problem, protection, sky, smog, smoke, smokestack, station, steam, technology, toned, toxic, urban, warming,